Enter sqlplus username/password@localhost/database in the cmd command
For example, sqlplus scott/Admin518@localhost/ORCl can enter the oracle database
Then come out sql>, you can enter various statements
select * from all_tables WHERE owner='SCOTT' ;//Display all tables in scott
CREATE SEQUENCE "SCOTT"."seq2" MINVALUE 1 MAXVALUE 9999999999999999999999999999 INCREMENT BY 1 START WITH 1 CACHE 20 NOORDER NOCYCLE